Hancock Shawn M, Spier Bret J, Pfau Patrick R
Section of Gastroenterology and Hepatology, Department of Medicine, University of Wisconsin Hospital and Clinics, Madison, Wisconsin, USA.
Gastrointest Endosc. 2008 Jul;68(1):151-2. doi: 10.1016/j.gie.2007.12.049. Epub 2008 Apr 10.